Pour a little water around the base of the coil while running and if engine stops running thats the problem.Coils tend to get small cracks that moisture gets into.Caused by engine heat and its own high operating temp.

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Hello, the reason the choke improves performance in the colder weather is, because an engine needs more fuel in the cold temp. It doesn't burn as easily as it does when the temperature is warm or after engine is warm.Please rate this answer. Thank you